NISSAN X-Trail - rough idling, reduced engine power, error codes: P1121 & P1122

The following problem is observed on the vehicles mentioned above. After starting the vehicle, there is rough idling, the engine speed goes up and down in short intervals and does not remain constant. Furthermore, the engine power is reduced and the following error codes may be stored in the control unit: P1121, P1122. A defective throttle valve housing can be diagnosed as the issue. Please proceed as follows to rectify the problem: Replace the defective throttle valve housing with a new one in accordance with the manufacturer's specifications and teach it in. Next, you should perform an error code query and a test drive to check whether the repair measure has worked.